Scaffold C++20 screencast project with Meson, agent workflow, and phase plan

.agents/MEMORY.md

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+# Project Memory — screen_cast
+
+Last updated: initial scaffold.
+
+## Project state
+
+- Empty project scaffolded with Meson build, C++20, module headers, and agent
+  workflow files.
+- No implementation yet; headers are placeholders.
+- Phase plan is in `docs/PHASES.md`. Agents are now explicitly instructed in
+  `AGENTS.md` to read `docs/PHASES.md` before planning and not to start work
+  belonging to a later phase unless requested.
+
+## Decisions
+
+- Language: C++20 with explicit modern-C++ guidelines in `AGENTS.md` and
+  `cpp-meson-build/SKILL.md`.
+- Build system: Meson.
+- Capture: PipeWire + xdg-desktop-portal.
+- Encode/Decode: FFmpeg (libavcodec, libavutil, libswscale).
+- Transport: RTP over UDP; signaling via WebSocket/JSON.
+- Discovery: mDNS/Avahi.
+- Rendering: SDL2 or SDL3 + OpenGL.
+- Namespace: `sc`.
+
+## Active blockers
+
+None.
+
+## Open questions
+
+- GUI framework (Qt6 vs. none / CLI only) — deferred to later phase.
+- Hardware acceleration strategy (VAAPI / Vulkan Video / NVENC) — evaluate after
+  software encode path works.